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Which extinct holostean order had pavementlike crushing teeth?

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holostean Living and fossil forms of Holostei.

The extinct holostean order characterized by having upper and lower dentitions modified into an open pavement of crushing teeth is the Pycnodontiformes.1

While these fish are unique among holosteans for this specialized crushing dentition, many pycnodonts also possessed anterior teeth that were incisiform, likely used for grasping prey. In addition to their distinct dental structure, members of this order are typically recognized by their deep, disk-shaped bodies and highly maneuverable swimming capabilities.1